Rumorsareeverywhere,spreadingfear,damagingreputations,andturningcalmsituationsinto____ones.

Thefirststepinthestudyofanylanguageisobservingand____preciselywhathappenswhennativespeakersspeakit.

Wecanhear（）fromthebackoftheroom.

WhenIgotoutofthecarandwalkedaboutamongthem,____oneoldmanwhoshookhisheaddisapprovingly,theyallbegantocheer.

Whichissafer-stayingathome，travelingtoworkonpublictransport，orworkingintheoffice?Surprisingly，eachofthesecarriesthesamerisk，whichisverylow.However，whataboutflyingcomparedtoworkinginthechemicalindustry?Unfortunately，theformeris65timesriskierthanthelatter!Infact，theaccidentrateofworkersinthechemicalindustryislessthanthatofalmostanyofhumanactivity，andalmostassafeasstayingathome.

Thetroublewiththechemicalindustryisthatwhenthingsgowrongtheyoftencausedeathtothoselivingnearby.Itisthiswhichmakeschemicalaccidentssonewsworthy.Fortunately，theyareextremelyrare.ThemostfamousoneshappenedatTexasCity(1947)，Flixborough(1974)，Seveso(1976)，Pemex(1984)andBhopal(1984)。

Someofthesearealwaysinthemindsofthepeopleeventhoughthelossoflifewassmall.NoonediedatSeveso，andonly28workersatFlixborough.TheworstaccidentofallwasBhopal，whereupto3，000werekilled.TheTexasCityexplosionoffertilizerkilled552.ThePemexfireatastorageplantfornaturalgasinthesuburbsofMexicoCitytook542lives，justamonthbeforetheunfortunateeventatBhopal.

Someexpertshavediscussedtheseaccidentsandusedeachaccidenttoillustrateaparticulardanger.ThustheTexasCityexplosionwascausedbytonsofammoniumnitrate(硝酸铵)，whichissafeunlessstoredingreatquantity.TheFlixboroughfireballwasthefaultofmanagement，whichtookriskstokeepproductiongoingduringessentialrepairs.TheSevesoaccidentshowswhathappensifthelocalauthoritieslackknowledgeofthedangerontheirdoorstep.Whenthepoisonousgasdriftedoverthetown，localleaderswereincapableoftakingeffectiveaction.ThePemexfirewasmadeworsebyanoverloadedsiteinanovercrowdedsuburb.Thefiresetoffachainreactionosexplodingstoragetanks.Yet，byamiracle，thetwolargesttanksdidnotexplode.Hadthesecaughtfire，then3，000strongrescueteamandfirefighterswouldallhavedied.

1.Chemicalaccidentsareusuallyimportantenoughtobereportedasnewsbecause____.

A.theyareveryrare

B.theyoftencauselossoflife

C.theyalwaysoccurinbigcities

D.theyarousetheinterestofallthereaders

2.Whichofthefollowingstatementsistrue?

A.Workingattheofficeissaferthanstayingathome.

B.Traverllingtoworkonpublictransportissaferthanworkingattheoffice.

C.Stayingathomeissaferthanworkinginthechemicalindustry.

D.Workinginthechemicalindustryissaferthantravelingbyair.

3.Accordingtopassage，thechemicalaccidentthatcausedbythefaultofmanagementhappenedat____.

A.TexascityB.FlixboroughC.SevesoD.MexicoCity

4.Fromthediscussionamongsomeexpertswemaycocludethat____.

A.toavoidanyaccidentsweshouldnotrepairthefacilitiesinchemicalindustry

B.thelocalauthoritiesshouldnotbeconcernedwiththeproductionofthechemicalindustry

C.alltheseaccidentscouldhavebeenavoidedorcontrolledifeffectivemeasurehadbeentaken

D.naturalgasstoredinverylargetanksisalwayssafe

5.Fromthepassageweknowthatammoniumnitrateisakindof____.

A.naturalgas，whichcaneasilycatchfire

B.fertilizer，whichcan'tbestoredinagreatquantity

C.poisonoussubstance，whichcan'tbeusedinovercrowdedareas

D.fuel，whichisstoredinlargetanks